Yawning redirects here. For the fish species, see Yawning (fish) . A yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the eardrums, followed by an exhalation of breath.Yawning (oscitation) most often occurs in adults immediately before and after sleep, during tedious activities and as a result of its contagious quality. yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the eardrums, followed by an exhalation of breath. Yawning (oscitation) most often occurs in adults immediately before and after sleep, during tedious activities and as a result of its contagious quality.
A radiological emergency is an emergency in which there is, or is perceived to be, a hazard due to radiation exposure from a source. As sources of radiation are used in various fields, including industry, medicine and research, radiological emergencies may occur anywhere. These are examples of radiological emergency situations and associated conditions that a first responder may face: 1  Medical Symptoms of Radiation Exposure. 2  Loss or Theft of Dangerous Radioactive Source. 3  Public Radioactive Contamination/Exposure.
Interventional radiology (IR), also known as vascular and interventional radiology (VIR) or surgical radiology, is an independent medical specialty, which was a sub-specialty of radiology until recently, that uses minimally invasive image-guided procedures to diagnose and treat diseases in nearly every organ system.nterventional radiology (IR), also known as vascular and interventional radiology (VIR) or surgical radiology, is an independent medical specialty, which was a sub-specialty of radiology until recently, that uses minimally invasive image-guided procedures to diagnose and treat diseases in nearly every organ system.